Crankshaft lathe



' Feb. 27, 1940. w F GRENE. 2,191,935

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Feb. 27, 1940.` w. F. GROENE 2,191,935

l CRANKSHAFT LATHE Filed May 2, 1959 19 Sheets-Sheet 2 T I l wvmesses. l INVENTOR.

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ATTORNEY.

W. F. GROENE Feb. 27, 1940.

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19 Sheets-Sheet 3 ||||||||||nuu INVENTQR.

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l cRANKsHAFT LATHE Filed May 2, 1939 19 Sheets-Sheet 5 ATTORNEY.

Feb. 2v, 1940. w. F; GROENE 2,191,935

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Fel.A 27, 1940. W F R'QENE 2,191,935 v CRANKSHAFT LATHE INVENT WITNESSES. wiLLiAM EGR E ATTORNEY.

W. F. GROENE CRANKSHAFT LATI-IE FiledMay 2, 1939 19 Sheets-Sheet 9 LS-E.

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1NVENTOR wlLmAM F.G.ROENE ATTORNEY.

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Feb 27 1940- v w. F. G'RoENE CRANKSHAFTVLTHE Filed May 2. '1939 19V sheets-sheet 1or INVENTOR.

WILLIAM RGROENE BY Ld M @MA v l ATTORNEY.

wWNEss'as. ww 02 Feb. 21, 1940. w. F. @CENE 2,191,935

CRANKSHAFT @ATI-IE Filed May 2, 1959 19 Sheets-Sheet 11 E v INVENTOR.

WTNESSES. WVU-UAM F. GROENE ATTORNEY.

Feb. 27, 1940.

w. F. GROENE cRANxsl-:AAFT LATHE Fil'ed May 2,` 1939 19 sheets-sheet 12 INVNTOR WILLIAM EGRQENE wxnesses.

19 sheets-sheet 15 .HIV H17 ,om om INVENT OR. W\LLU\M F. G'ROENEA ATTORNEY.

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CRANKSHAFT LATHE Filed May 2, 1939 19 Sheets-Sheet 15 INVENTOR WITNESSES. WlLLAM F. GROENE 1 v BY w ATTORNEY.

Feb. 27, 1940. w. F. GROENE CRANKSHAFT LATHE Filed May 2, 1939 19 Sheets-Sheet 16 INVENTOR WlLLIAM EGROENE BY ATTORNEY.

WITNEssES.

Feb. 27, 1940. w. F. GROENE 2,191,935

' CRANKSHAFT LATHE Filed May 2,v 19:59V 19 Sheets-Sheet 17 IN VENT OR.

ATTORNEY.

Feb. 27, 1940. w. F. -GROENE CRANKSHAFT LATHE med may 2, 19:59

19 Sheets-Sheet 18 noentor WILLIAM F. qRoeNe WITNESSES.

BY I' l L/M Ctttorneg W. F. GROENE CRANKSHAFT LATHE Feb. 27, 1949.

Filed May 2. 1959 19 Sheets-Sheet 19 5m i mmm wrm @MMP mom INVENT OR.

m. M M w Patented Feb. 27, 1940 UNITED STATES PATENT OFFICE UBANKSHAFT LATHE Application 2, 1939 SeriaLNo. 271,304

37 Claims.

accuracy and particular smoothness for the flny ,\ished surfaces. Because of the limberness and 10 tendency of crankshaft to bend, twist, and warp during the cutting operation, great difficulty is experienced with destructive chatter and vibration which is setup between work and tool during the cutting operation. This results in inaccurate 15. machining of the work piece and-in unsatisfactory finish for the completedl surfaces. It hasy been found, however, that by providing certain vibration damping means in connection with the tool feeding mechanism that this chatter is elim- 20 inated by preventing the minute relative movement between the tool and work which is the source of the chatter.

One of the objects of this invention is to provide vibration damping means for the tool bars 25 which feed the cutting tools to the work crankshaft to be machined. In a machine of this particular type large numbers of cutting tools are applied to the crankshaft from various different directions which results in excessive. strain being 30 imparted to the work because of the large amount of metal beingv removed in a very short space of time. It is, therefore, found that this vibration damping arrangement is absolutely essential to the successful operation of a machine capable of sisl performing the high productive operations of the machine herein sety forth.

' Another obieot or this invention is to providel means forfeeding tools lfrom various directions relative to the work piece'in which all of the back 40' lash in feeding mechanism is eliminatedv and vibration damped out so that an absolutely positive lforward feeding movement of the tool, without any minute reciprocating backward move rhait and to provide o. third eet oi `iinieiiinir tools coming in from a different direction for accurately finishing d i'oush` turned portions during 'of saidportionl so that no time (Cl. 82-9) r is lost between .roughing and nnishing operations in the machine. l

Still another object of this invention is to provide in a crankshaft lathe for turning all of the line bearings, flange and stub ends, of y crank- 5 shafts, three sets of cutting tools operating from three different directions for roughing out all of lthe flange end of the crankshaft while other sets of tools rough 'out the line bearing portionsand stub ends of ysaid shaft, and to provide in addition to said-mentioned tools, and operating. simultaneously therewith, a set of finishing tools which complete the accurate machining of all of said line bearing portions of said work crankshaft.

Another object is to provide a cam feed mechanism for each individual tool actuating member of the lathe for roughing out all of the line bearing portions of a crankshaft. said cam mechanismbeing carried in the' tool units and center drive ring gear housings which form a solid block 2g of metal inthe lathe. This cam feed mechanism is arranged so as to effect variable and independent feeding movements for each of the cutting tools of the lathe so as to reduce the turning of v all of the various different line bearing portions of the crankshaft to a minimum of cutting time.

Another unique feature of this invention is to provide a unique tool feeding cradle associated with the roughing tools for completely nnish turning all of the line bearing portions of a 30 crankshaft. 'I'his finishing tool cradle incorporates the features of supporting and feeding of the finishing tools'to the work piece, serves as the chip pan and guard for the front of the lathe, and also provides the coolant distributing system for all of the cutting tools of the lathe. v

- Another object ofthis invention is to provide a finishing tool feeding device which is cam fed and which is stopped in accurate feed position for sizing the work to accurate finished dimensions 4o bymeans of a positive abutment on the frame of themachine.' g

`Also incorporated with this finishing-tool feeding cradle is resilient vibration damping means which-absorbsall vibration from said cradle. dur- 4 ing its feeding movement to the abutment for `,accurately sizing the workpiece.

Further objects and advantages of my invention will be set forth in the ldescription. of the .drawings in which: i o

Figure I isa front perspectiveview of a center i wlatheembodyingtheprincipicsofmyinven ffisaplanvie'wofthemachineshown inliiginof. f u 

